The ratio of area of two circles is 1:9.If the radius of the smaller circle is 5cm, the length if the radius of the larger circle is

Can someone answer this question? : )

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?